Improvement in piston-packing



@with gieten gamut @frn ALUTHER W. CAMPBELL, or AURORA, ILLINOIS, AssIeNon To' HIMSELF,

A. T. HALL, c. F. ALLEN, AND A. J. AMBLIIR..

Letters Patent No. 70,521, dated November 5, 1867.

IMPRQVEMENT IN PISTON-PACKING.

TO ALL WHOM IT MAY CONCERN:

p Be it known that I, LUTHER W.v CAMPBELL, oi Aurora, in the county of Kane, and State ot' Illinois, have. invented a new and useful Improvement in Metallic Packing for Piston-Heads ot Steam Engines;'and I'do hereby deelare'that the following'is a'full, clear, and exact description of the same, reference being had to the annexed drawings making part of this specification, in whicl1- Figure 1 isa side elevation.

Figure 2 is a vertical longitudinal section.v

Figure Sis a plan view, and

Figure 4 is a vertical transverse section. p

'.lhe same letters are cmployedlin all the figures in the indication of identical parts.

This improvement consists in a novel arrangement ofthe heads, elastic metallic p'acking-ringsfand conica 4expansion-rings, of a piston for the cylinder of a steam engine, the nature of which will fully appear from the followinl, .,`r description and claims.

In the drawings A is a central huh,` cast with and forming a part-of the head B, and Ermly attached to the p piston-rod C. This hub has an inclined face, forming the frustum of a cone shown at A', iig. 2, and radial arms, to which the plate B is attached by bolts D entering thenrms at D. The elastic packing-rings are placed between the heads B B', and around the conical face A ot' the hub. The first f theseriesE is inclined on its inner face to correspond with thefacc A of the huh to which it is fitted, so that when pressed upon the hub it will be expanded. The outer face is parallel with the here of thc'cylinder. I Around the ring E is plnced'a thin ring, F, for the purpose ot` makingjoints and preventing the passage of steam through'the openings inthe packing-rings. Around this is another conical ring, G,inclined on its outer' face in a direction opposite to the inclination of the face A of thehub. Next in order is the ring K, the inner face of which is inclined to cor.- respond with the inclination of the outer face of the ring G, upon which it is itte'lhso that, as it is forced upon the latter, it will be expanded. The exterior face of the ring K is parallel to the bore of the cylinder. Around the ring K are placedthe cxpansionfrings III-I, which, being' pressed outwardly against the cylinder, fo'rmthe paclting. A series of holes, J J,`is bordd through the head 13,hy which steam is admitted against the edge lof the conical ring G, forcing it into thc ring K, and expanding that and the packing-rings I-I H, while the steam is admitted into one end of the cylinder. 'When the steam is admitted into the other end of the cylinder, enterr-v ingl through 'similar openings J J in the head B', it presses upon the edge of the ring E, forcing it upon thc face A of the hub, and expanding it and all the eitcrior rings. A recess is formed in the head Bl to receive the ring G, and a similar rcccssis formed in the head B to receive the ring E.

What Iv'elaim as my invention, and desire to 'sccureby Letters Patent, is j 1. So arranging a series of concentric elastic rings, K,'G, and E, having alternately inclined faces, that, acting in combination with the conical hul) A and packing-rings H II, they shall maintain :In uniform outward l pressure upon the latter by the action of the steamaltcrnately entering each end of thecyhnder, substantially as set forth.

2. The combination of 'the perforated heads I3 opera-te substantially as set forth.

lntestimony whereof I have hereunto .set my hand in t B', conical hub A, and rings E, F, G, K, and Il, arranged to he presence of twosuhscribing witnesses.

L. W. CAMPBELL.

Witnesses:

RICHARD J. Moena, W. F; WHITnHoUsn. s. 

